Tolerance of Several Novi Sad Sunflower Hybrids to Phomopsis Stem Canker under Natural Infection
Otpornost novosadskih hibrida suncokreta prema prouzrokovaču mrko-sive pegavosti stabla u uslovima prirodne zaraze
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Author
Dedic, Bosko
Balalic, Igor
Radeka, Ilija
Lacok, Nada
Tancic, Sonja
Keywords
SunflowerPhomopsis stem canker
Resistance
Hybrids
Suncokret
mrko-siva pegavost stabla
otpornost
hibridi
Metadata
Show full item recordAbstract
Sunflower diseases have a major impact on sunflower yield and quality of seed. When
conditions during vegetation are favorable, the intensity of damage can be very high.
Therefore, surveys of economically important diseases are necessary. A survey of incidences
and severity of phomopsis stem canker was performed on 9 locations during 2007 and
2008. A total of 8 hybrids per location was examined. Lodging of plants as a symptom
of stem canker disease was not detected. The mean disease incidence was less than 5%,
depending on hybrid, location and year. Generally, higher deasease incidence was recorded
in the first year of survey than in the second. The hybrids Velja, NS-H-111 and Baæa demonstrated
an elevated level of resistance. Despite significant differences in disease severity
that was found among the hybrids tested, all of them were highly resistant to phomopsis
stem canker. Suncokret predstavlja našu najvažniju biljnu vrstu za dobijanje kvalitetnih biljnih ulja.
Napada ga više od 40 raznih prouzrokovača bolesti od kojih samo određeni broj predstavlja
problem u proizvodnji. Praćenje njihove pojave je značajno sa aspekta suzbijanja jer doprinosi
stabilnosti proizvodnje. Pojava mrko-sive pegavosti stabla praćena je 2007. i 2008.
godine u mreži demonstracionih ogleda. U prvoj godini posmatranja zabeležena je veća
pojava bolesti na svim lokalitetima u odnosu na drugu godinu. Među hibridima u obe godine
posmatranja najveća otpornost prema Phomopsis heliathi zabeležena je kod hibrida
NS-H-111, Velja i Baća. Uprkos značajnim razlikama u intenzitetu pojave mrko-sive pegavosti
stabla između hibrida, nije zabeležena jača pojava bolesti iz čega proizilazi da posmatrani
hibridi poseduju visok stepen otpornosti prema Ph. helianthi u agroekološkim uslovima
Vojvodine.